@article{eage:/content/journals/10.1144/petgeo2013-044, author = "Tudge, Joanne and Lovell, Mike and Davies, Sarah and Millar, Mike", title = "A novel integrated approach to estimating hydrocarbon saturation in the presence of pore-lining chlorites", journal= "Petroleum Geoscience", year = "2014", volume = "20", number = "2", pages = "201-209", doi = "https://doi.org/10.1144/petgeo2013-044", url = "https://www.earthdoc.org/content/journals/10.1144/petgeo2013-044", publisher = "European Association of Geoscientists & Engineers", issn = "1354-0793", type = "Journal Article", abstract = "Pore-lining chlorites are often associated with a low-resistivity contrast between corresponding reservoir units, making the identification and quantitation of hydrocarbon-bearing intervals difficult. In many low-resistivity situations, the traditional approach of using Archie’s equation to determine saturation from electrical resistivity fails, and modified Archie equations derived specifically for ‘shaly sands’ have been developed. In chlorite-bearing intervals, however, the effect of chlorite can be such that both Archie and the so-called shaly-sand models are inappropriate. Under these circumstances, calculating saturation from electrical resistivity can be circumvented by detailed analysis of the sedimentology and petrophysics, enabling the construction of a saturation height model based on core data. In this novel study we integrate a detailed core-based sedimentological facies scheme with wireline log data and petrophysical core data to demonstrate a clear link between chlorite occurrence, petrophysical characteristics and saturation height. Through this innovative approach, saturation is estimated without recourse to resistivity logs and improves hydrocarbon saturation estimates in chlorite-bearing reservoirs.", }